The black death began to spread in about 1437 during the Middle Ages from fleas that bit mice and rats that were infected with a the black death. The fleas would swell from the infected blood they took in and vomit it out. Fleas love to bite humans bite humans any chance they get. Infected fleas bit any human they could find spreading the black death.
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The Bubonic Plague originated in Asia when the Mongols were invading othere territories, they took the plague with them to Europe
It came to Europe from Asia. It travelled on rats which came to Europe on boats. The fleas on the rats was the actual thing that spread the disease.